New and longtime sellers alike have used data at one point or another to boost t-shirt sales. Data is used to determine which t-shirt colors sell the best, which genders to target, which niches to upload to, and which trends are popular.

Now that Merch has been around for several years (and millions of shirts have been uploaded), getting your shirts noticed is getting even harder. Tools like Merch Informer have made it easier to find best-selling shirts, but when it comes to finding out trending shirts, it’s not always the best solution. A lot of these Merch by Amazon research tools use historical data.